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United States Patent | 5,278,453 |
Pollmeier | January 11, 1994 |
A voltage supply system with a plurality of voltage outputs is supplied by at least two constant-voltage sources. One voltage output can be supplied alternatively by one or the other voltage source. The alternate supply of voltage output is affected by means of control signals which control a switching arrangement. The control signals are extended to provide a period of overlap such that one voltage supply is connected to the output before another voltage supply is disconnected. As a result, a power loss due to the switching operation is reduced, and substantially compatible voltage levels are produced.
Inventors: | Pollmeier; Werner (Verl, DE) |
Assignee: | Siemens Nixdorf Informationssysteme (Paderborn, DE) |
Appl. No.: | 635106 |
Filed: | January 10, 1991 |
PCT Filed: | May 18, 1989 |
PCT NO: | PCT/EP89/00547 |
371 Date: | January 10, 1991 |
102(e) Date: | January 10, 1991 |
May 18, 1988[DE] | 3816944 |
Current U.S. Class: | 307/44; 307/66; 307/87 |
Intern'l Class: | H02J 009/06; H02J 003/02; H02H 003/093 |
Field of Search: | 307/64,66,85-87,43,44,48 365/228,229 |
3932764 | Jan., 1976 | Corey | 307/85. |
4122359 | Oct., 1978 | Breikss | 307/64. |
4297590 | Oct., 1981 | Vail | 307/43. |
4323788 | Apr., 1982 | Smith | 307/66. |
4492876 | Jan., 1985 | Colbert et al. | 307/66. |
4517470 | May., 1985 | Cheffer | 307/64. |
4617473 | Oct., 1986 | Bingham | 307/66. |
4745299 | May., 1988 | Eng et al. | 307/66. |
4812672 | Mar., 1989 | Cowan et al. | 307/64. |